How games award UGC accessories?

Hello, recently I saw many games awarding users UGC items. (Via badges I think.) And I was wondering how can I do the same at my games, and if yes, what do I need for it?

I think (unless I am incorrect) only companies that work with Roblox has this feature. I have seen no other game expect companies have this feature.

probaly in a near future they will make it so players ( verified , or some specific users ) will be able to do the same thing

however, i don’t know if they will be to use other’s UGC to award it

(kinda obvious that it will be their own UGC)
(but that also makes mandatory to be an UGC creator )